Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. An organic light emitting display device comprising: a first pixel region including first pixels, which are coupled to first scan lines, second scan lines and emission control lines; a first scan driver which supplies a first scan signal to each of the first scan lines coupled to the first pixels; a second scan driver which supplies a second scan signal to each of the second scan lines coupled to the first pixels; and an emission driver which supplies a light emission control signal to the emission control lines coupled to the first pixels, wherein the organic light emitting display device is driven in a second mode when the organic light emitting display device is mounted in a wearable device, and is driven in a first mode otherwise, wherein the first pixels are driven based on a data signal when the organic light emitting display device is driven in the first mode and the second mode, wherein the second scan driver supplies k second scan signals to each of the second scan lines during each frame period when the organic light emitting display device is driven in the first mode, and supplies j second scan signals to each of the second scan lines during each frame period when the organic light emitting display device is driven in the second mode, and wherein k is a natural number, and j is a natural number greater than k.
2. The organic light emitting display device of claim 1 , further comprising: a second pixel region including second pixels driven based on the data signal when the organic light emitting display device is driven in the first mode, wherein the second pixel region is set to be in a non-emission state when the organic light emitting display device is driven in the second mode.
An organic light emitting display device includes a first pixel region with pixels that emit light based on a data signal when the device operates in a first mode. The device also includes a second pixel region with pixels that emit light based on the same data signal when operating in the first mode. However, when the device switches to a second mode, the second pixel region is deactivated and does not emit light, while the first pixel region continues to emit light. This configuration allows the display to dynamically adjust its emission areas based on the operating mode, potentially improving power efficiency or enabling specialized display functions. The first and second pixel regions may be arranged in a specific pattern or layout to optimize performance in different modes. The device may also include additional components, such as a driver circuit, to control the switching between modes and the emission states of the pixel regions. This design is useful for applications requiring variable display brightness or partial screen activation, such as in mobile devices or energy-efficient displays.
3. The organic light emitting display device of claim 2 , further comprising: a third pixel region including third pixels driven corresponding to the data signal when the organic light emitting display device is driven in the first mode, wherein the third pixel region being set to be in the non-emission state when the organic light emitting display device is driven in the second mode.
An organic light emitting display device includes a display panel with multiple pixel regions, each containing pixels that emit light based on a data signal. The device operates in at least two modes: a first mode for normal display operation and a second mode for reduced power consumption or specific functionality. In the first mode, all pixel regions, including a primary pixel region and a secondary pixel region, are active and emit light according to the data signal. The secondary pixel region may have a different resolution or pixel density compared to the primary pixel region. In the second mode, the secondary pixel region is deactivated and does not emit light, while the primary pixel region remains active. Additionally, the device includes a third pixel region that is active in the first mode, emitting light based on the data signal. However, in the second mode, this third pixel region is also deactivated and does not emit light. This selective activation and deactivation of pixel regions allows the display to optimize power consumption and adapt to different operational requirements. The device may further include a controller to manage the switching between modes and control the emission states of the pixel regions.
4. The organic light emitting display device of claim 3 , wherein the first pixel region is located between the second pixel region and the third pixel region.
An organic light emitting display device includes a substrate with multiple pixel regions, each containing an organic light emitting diode (OLED) and a thin film transistor (TFT) for driving the OLED. The device has at least three pixel regions: a first pixel region, a second pixel region, and a third pixel region. The first pixel region is positioned between the second and third pixel regions. Each pixel region emits light of a different color, such as red, green, and blue, to form a full-color display. The TFTs in each pixel region control the current supplied to the OLEDs, determining the brightness and color output. The arrangement of the first pixel region between the second and third pixel regions optimizes the spatial distribution of colors, improving color uniformity and reducing visual artifacts like color fringing. The device may also include additional layers, such as encapsulation layers to protect the OLEDs from moisture and oxygen, and insulating layers to electrically isolate the TFTs and OLEDs. The overall structure ensures efficient light emission while maintaining high display quality.
5. The organic light emitting display device of claim 1 , wherein the emission driver supplies p light emission control signals to each of the emission control lines when the organic light emitting display device is driven in the first mode, wherein p is a natural number, and the emission driver supplies 1 light emission control signals to each of the emission control lines when the organic light emitting display device is driven in the second mode, wherein 1 is a natural number greater than p.
This invention relates to an organic light emitting display device with a configurable emission control system. The device addresses the challenge of balancing power efficiency and display performance by dynamically adjusting the number of light emission control signals supplied to emission control lines based on the operating mode. The display device includes an emission driver that controls light emission in pixels through emission control lines. In a first mode, the emission driver supplies p light emission control signals to each emission control line, where p is a natural number. This mode prioritizes power efficiency by reducing the frequency of light emission control signals. In a second mode, the emission driver supplies l light emission control signals to each emission control line, where l is a natural number greater than p. This mode enhances display performance by increasing the frequency of light emission control signals, allowing for finer control over light emission. The emission driver dynamically switches between these modes to optimize power consumption and display quality based on the operating conditions. This adaptability ensures efficient power usage while maintaining high-quality visual output when needed. The invention improves the versatility of organic light emitting displays by providing a configurable emission control mechanism.
6. The organic light emitting display device of claim 1 , wherein each of the pixels located on an i-th pixel row comprises: an organic light emitting diode; a pixel circuit which stores a voltage of the data signal applied thereto when the first scan signal is supplied to an i-th first scan line of the first scan lines, and controls a supply time of a current to the organic light emitting diode, based on a light emission control signal supplied to an i-th emission control line of the emission control lines; and a first transistor coupled between an initialization power source and an anode electrode of the organic light emitting diode, wherein the first transistor is turned on when the second scan signal is supplied to an i-th second scan line of the second scan lines, and wherein i is a natural number.
This invention relates to an organic light emitting display device with improved pixel control for enhanced display performance. The device addresses issues such as image retention and power efficiency by incorporating a dedicated initialization transistor in each pixel to reset the organic light emitting diode (OLED) before new data is written. Each pixel in a given row includes an OLED, a pixel circuit, and a first transistor. The pixel circuit stores a data signal voltage when a first scan signal is applied to the corresponding row, controlling the current supply to the OLED based on an emission control signal. The first transistor connects the OLED's anode to an initialization power source when a second scan signal is applied, ensuring proper reset of the OLED. This initialization step prevents residual charge from affecting subsequent frames, improving display uniformity and reducing power consumption. The device uses multiple scan lines—first scan lines for data writing, second scan lines for initialization, and emission control lines for light emission timing—to independently manage these functions. The invention enhances display quality by ensuring consistent OLED operation across all pixels.
7. The organic light emitting display device of claim 6 , wherein a voltage of the initialization power source has a predetermined voltage level such that the organic light emitting diode emits no light when the voltage of the initialization power source is applied thereto.
This technical summary describes an organic light emitting display device with an initialization power source that prevents unintended light emission during initialization. Organic light emitting diodes (OLEDs) are used in displays to emit light when current flows through them. However, during initialization or power-up sequences, unintended voltage fluctuations can cause the OLEDs to emit light, leading to display artifacts or reduced lifespan. The invention addresses this issue by configuring the initialization power source to apply a voltage with a predetermined level that ensures the OLEDs remain off during initialization. This voltage level is carefully selected to avoid activating the OLEDs while still performing necessary initialization functions, such as resetting pixel circuits or stabilizing voltages. The device includes a display panel with multiple OLEDs, each connected to a pixel circuit that controls light emission. The initialization power source is connected to these circuits to provide the controlled voltage during startup. By ensuring the OLEDs do not emit light during initialization, the invention prevents visual disturbances and extends the lifespan of the display. The predetermined voltage level is designed to avoid exceeding the threshold voltage required for light emission, thus maintaining display quality and reliability. This solution is particularly useful in high-resolution or high-brightness OLED displays where initialization artifacts are more noticeable.
8. The organic light emitting display device of claim 6 , wherein, when the organic light emitting display device is driven in the first mode, the emission driver supplies a light emission control signal to the i-th emission control line during a partial period in one frame period, the first scan driver supplies the first scan signal to an (i−1)-th first scan line of the first scan lines and the i-th first scan line to overlap with the light emission control signal, and the second scan driver supplies the second scan signal to the i-th second scan line to overlap with the light emission control signal.
This invention relates to organic light emitting display devices, specifically addressing the challenge of improving display performance by optimizing scan and emission control signals during operation. The device includes a display panel with pixels arranged in rows and columns, where each pixel is connected to a first scan line, a second scan line, and an emission control line. The display operates in at least two modes: a first mode for normal operation and a second mode for low-power or alternative operation. In the first mode, the emission driver provides a light emission control signal to the i-th emission control line during a partial period within one frame period. Simultaneously, the first scan driver supplies a first scan signal to both the (i−1)-th and i-th first scan lines, ensuring these signals overlap with the light emission control signal. The second scan driver provides a second scan signal to the i-th second scan line, which also overlaps with the light emission control signal. This overlapping timing ensures synchronized control of pixel emission and scan operations, enhancing display efficiency and reducing power consumption. The second mode may involve different signal timing or configurations to achieve specific performance goals, such as lower power or higher refresh rates. The invention improves display functionality by precisely coordinating scan and emission signals to optimize pixel operation.
9. The organic light emitting display device of claim 8 , wherein the light emission control signal is set to be an gate-off voltage, and the first scan signal and the second scan signal are set to be a gate-on voltage.
An organic light emitting display device includes a pixel circuit with a driving transistor, a light emitting element, and a plurality of transistors for controlling the pixel circuit. The device operates by applying a light emission control signal, a first scan signal, and a second scan signal to the pixel circuit. The light emission control signal is set to a gate-off voltage, which prevents the driving transistor from supplying current to the light emitting element, effectively turning off light emission. Simultaneously, the first scan signal and the second scan signal are set to a gate-on voltage, which activates the transistors controlling the pixel circuit. This configuration allows the pixel circuit to be initialized or reset while preventing unintended light emission, ensuring accurate control of the display's brightness and reducing power consumption. The device is particularly useful in high-resolution displays where precise timing and signal control are critical for maintaining image quality. The combination of these signal states ensures stable operation and improves the overall efficiency of the display.
10. The organic light emitting display device of claim 8 , wherein the i-th second scan line is defined by any one of the first scan lines supplied with the first scan signal to overlap with the light emission control signal supplied to the i-th emission control line.
An organic light emitting display device includes a plurality of pixels arranged in a matrix, each pixel having a light emitting element, a driving transistor, and a storage capacitor. The device further includes a plurality of first scan lines for supplying a first scan signal, a plurality of second scan lines for supplying a second scan signal, and a plurality of emission control lines for supplying a light emission control signal. The first scan signal initializes the driving transistor, the second scan signal controls the data voltage applied to the pixel, and the light emission control signal controls the light emission of the pixel. The device is configured such that an i-th second scan line is defined by any one of the first scan lines, where the first scan signal overlaps with the light emission control signal supplied to the i-th emission control line. This overlap ensures proper synchronization between the scan and emission control signals, preventing data voltage corruption and improving display uniformity. The configuration reduces the number of scan lines required, simplifying the display structure while maintaining accurate pixel control. The device is particularly useful in high-resolution displays where signal timing and synchronization are critical.
11. The organic light emitting display device of claim 10 , wherein the first scan driver and the second scan driver is disposed in a same scan driver.
An organic light emitting display device includes a display panel with a plurality of pixels arranged in rows and columns. Each pixel includes an organic light emitting diode (OLED) and a driving transistor for controlling current flow through the OLED. The display device also includes a data driver for supplying data signals to the pixels and a scan driver for supplying scan signals to the pixels. The scan driver includes a first scan driver and a second scan driver, which are integrated into a single scan driver unit. The first scan driver generates a first scan signal to control a first switching transistor in each pixel, while the second scan driver generates a second scan signal to control a second switching transistor in each pixel. The first scan signal initializes the pixel circuit, and the second scan signal controls the emission of light from the OLED. By integrating both scan drivers into a single unit, the display device reduces circuit complexity and improves space efficiency while maintaining proper timing control for pixel operation. This configuration ensures accurate data writing and emission control, enhancing display performance.
12. The organic light emitting display device of claim 6 , wherein, when the organic light emitting display device is driven in the second mode, the emission driver supplies a first light emission control signal to the i-th emission control line, and the emission driver supplies a second light emission control signal to the i-th emission control line after a predetermined period from the first light emission control signal in one frame period.
An organic light emitting display device includes a pixel array with emission control lines and an emission driver. The device operates in multiple modes, including a first mode for normal display and a second mode for enhanced performance. In the second mode, the emission driver supplies a first light emission control signal to an i-th emission control line and then supplies a second light emission control signal to the same line after a predetermined delay within a single frame period. This dual-signal approach improves display efficiency or brightness control by modulating light emission timing. The pixel array may include pixels with organic light emitting diodes (OLEDs) and thin-film transistors (TFTs) for driving the OLEDs. The emission control lines regulate the light emission duration of the pixels, and the emission driver generates the control signals to activate or deactivate the emission control lines. The second mode may be used for high-dynamic-range (HDR) display, power-saving, or other advanced display techniques. The predetermined delay between the first and second signals allows precise control over the light emission timing, enhancing display performance.
13. The organic light emitting display device of claim 12 , wherein the predetermined period is set as a period, which is about 40% or less of the one frame period.
The invention relates to an organic light emitting display device designed to improve display quality by controlling the timing of light emission. The device includes a display panel with a plurality of pixels, each containing an organic light emitting diode (OLED) and a driving transistor. The OLED emits light based on a driving current controlled by the driving transistor. The display device operates in a frame period divided into multiple sub-periods, where the light emission of the OLED is activated for a predetermined period within each frame. This predetermined period is set to be about 40% or less of the total frame period, allowing for precise control of light emission duration. The device also includes a timing controller that generates control signals to regulate the light emission timing, ensuring consistent brightness and reducing power consumption. The driving transistor operates in a saturation region to maintain stable current flow, and the OLED emits light in response to the controlled current. By limiting the light emission period to 40% or less of the frame period, the device achieves improved image quality and efficiency. The invention addresses the problem of uneven brightness and excessive power consumption in conventional OLED displays by optimizing the light emission duration.
14. The organic light emitting display device of claim 12 , wherein the first scan driver supplies the first scan signal to the (i−1)-th first scan line and the i-th first scan line to overlap with the first light emission control signal, and the second scan driver supplies a first second scan signal to the i-th second scan line to overlap with the first light emission control signal, and supplies a second second scan signal to the i-th second scan line to overlap with the second light emission control signal.
This technical summary describes an organic light-emitting display (OLED) device with an improved scan and emission control scheme. The device addresses the challenge of achieving precise timing control for light emission and scan signals to enhance display performance, such as reducing power consumption and improving image quality. The display includes a pixel array with multiple scan lines and emission control lines. A first scan driver provides a first scan signal to adjacent scan lines (i−1 and i) in a staggered manner, overlapping with a first light emission control signal. This ensures that the scan and emission signals are synchronized, preventing unwanted light emission during scan operations. A second scan driver supplies two distinct second scan signals to the same second scan line. The first second scan signal overlaps with the first light emission control signal, while the second second scan signal overlaps with a second light emission control signal. This dual-signal approach allows for finer control over pixel charging and emission timing, improving efficiency and reducing crosstalk between adjacent pixels. The overlapping scan and emission signals ensure that pixels emit light only when intended, minimizing power loss and enhancing display uniformity. The staggered scan line activation further reduces the risk of signal interference, leading to a more stable and efficient display operation. This design is particularly useful in high-resolution OLED displays where precise timing control is critical.
15. The organic light emitting display device of claim 14 , wherein the first second scan signal and the second second scan signal have a same width as each other.
Organic light emitting display devices are used in various electronic displays, including smartphones, televisions, and digital signage. A common challenge in these displays is efficiently controlling the emission of light from organic light emitting diodes (OLEDs) to achieve high resolution and low power consumption. This requires precise timing and synchronization of scan signals that drive the display pixels. This invention relates to an organic light emitting display device with improved scan signal control. The device includes a display panel with multiple pixels arranged in rows and columns. Each pixel is connected to a first scan line and a second scan line, which receive first and second scan signals, respectively. The first scan signal is applied to a first group of pixels, while the second scan signal is applied to a second group of pixels. The first and second scan signals are synchronized to control the emission of light from the OLEDs in the pixels. The invention specifies that the first and second scan signals have the same pulse width, ensuring uniform timing for pixel activation across the display. This uniformity helps maintain consistent brightness and reduces power consumption by preventing overlapping or misaligned scan signals. The invention may also include additional features, such as a scan driver circuit that generates the scan signals and a timing controller that synchronizes the signals with other display operations. The use of equal-width scan signals simplifies circuit design and improves display performance.
16. The organic light emitting display device of claim 14 , wherein the second second scan signal has a width wider than a width of the first second scan signal.
An organic light emitting display device includes a pixel circuit with a driving transistor and a light emitting element, along with a scan driver circuit that generates scan signals to control the pixel circuit. The scan driver circuit produces a first second scan signal and a second second scan signal, where the second second scan signal has a pulse width greater than that of the first second scan signal. The pixel circuit is configured to receive these signals to control the emission of light from the light emitting element. The driving transistor operates in a saturation region during a threshold voltage compensation period, and the pixel circuit includes a storage capacitor to store a data voltage and a compensation voltage. The scan driver circuit also generates a first scan signal and a second scan signal, where the second scan signal has a pulse width greater than that of the first scan signal. The pixel circuit further includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor, each configured to control different operations such as data voltage storage, threshold voltage compensation, and light emission. The second second scan signal's wider pulse width ensures proper compensation and stable light emission by allowing sufficient time for the driving transistor to reach a stable state. This design improves display uniformity and reduces flicker by precisely controlling the timing of the compensation and emission phases.
17. The organic light emitting display device of claim 6 , wherein the pixel circuit comprises: a driving transistor which controls an amount of a current supplied from a first power source coupled to a first electrode thereof to the organic light emitting diode coupled to a second electrode thereof, based on a voltage of a first node; a second transistor coupled between a data line and the first electrode of the driving transistor, wherein the second transistor includes a gate electrode coupled to the i-th first scan line; a third transistor coupled between the second electrode of the driving transistor and the first node, wherein the third transistor includes a gate electrode coupled to the i-th first scan line; a fourth transistor coupled between the first node and the initialization power source, wherein the fourth transistor includes a gate electrode coupled to the (i−1)-th first scan line; a fifth transistor coupled between the first power source and the first electrode of the driving transistor, wherein the fifth transistor includes a gate electrode coupled to the i-th emission control line; a sixth transistor coupled between the second electrode of the driving transistor and the anode electrode of the organic light emitting diode, wherein the sixth transistor includes a gate electrode coupled to the i-th emission control line; and a storage capacitor coupled between the first power source and the first node.
An organic light emitting display device includes a pixel circuit designed to control current flow to an organic light emitting diode (OLED) for improved display performance. The pixel circuit features a driving transistor that regulates current from a first power source to the OLED based on a voltage at a first node. A second transistor connects a data line to the driving transistor's first electrode, controlled by an i-th first scan line. A third transistor connects the driving transistor's second electrode to the first node, also controlled by the i-th first scan line. A fourth transistor resets the first node by connecting it to an initialization power source, controlled by an (i−1)-th first scan line. A fifth transistor controls current flow from the first power source to the driving transistor, regulated by an i-th emission control line. A sixth transistor connects the driving transistor's second electrode to the OLED's anode, also controlled by the i-th emission control line. A storage capacitor maintains the voltage at the first node, ensuring stable current flow. This configuration enhances display uniformity and efficiency by precisely controlling current and voltage levels during operation.
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January 21, 2020
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